The number 1318
1318 is a composite number with 4 divisors. Its prime factorisation is 2 × 659. Divisors (4): 1, 2, 659, 1318.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 1318: a semiprime: 2 × 659, the product of two primes.
- 2
1318 is composite. Its prime factorisation is
- 3
The divisors add up to 1980; without 1318 itself that is 662, so 1318 is deficient (662 is less than 1318). Euler's totient φ(1318) = 658 numbers up to 1318 share no factor with it.
- 4
The digits of 1318 add up to 13, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 52 steps to reach 1.
LaTeX source of the formulas on this page
\[ 1318 = 2 \times 659 \]
1318 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 1980 |
| Euler totient φ(n) | 658 |
| Square | 1737124 |
| Cube | 2289529432 |
| Square root | 36.304270 |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 52 |
| Scientific notation | 1.318 × |
1318 in other forms
| Form | Value |
|---|---|
| In words | one thousand three hundred and eighteen |
| Roman numerals | MCCCXVIII |
| Binary (base 2) | 10100100110 |
| Octal (base 8) | 2446 |
| Hexadecimal (base 16) | 526 |
| Base 3 | 1210211 |
| As time | 1318 seconds = 21 min 58 s |
Is 1318 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (1318 ÷ 2 = 659) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 1) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 2) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 4) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 9) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 1318 a prime number?
No. 1318 = 2 × 659, so it is divisible by 2.
What are the factors of 1318?
1, 2, 659, 1318.
What is 1318 in binary?
10100100110 (hexadecimal 526, octal 2446).
What is the square root of 1318?
About 36.3043.
What is 1318 in Roman numerals?
MCCCXVIII.
Is 1318 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 1318?
1318 is a semiprime: 2 × 659, the product of two primes.